Welch Allyn CP 20 User Manual page 34

CP 20_______________________________________________________________________Section 3
Volume
This option defines the keyboard click loudness. Available settings rage from 0 (off) to 8 (loud).
TIP: Use the BACKSPACE key to erase entry errors
Battery Timeout
This setting determines when the cardiograph will switch off in order to conserve the battery life of the unit. The
battery timeout will only occur if the keypad has not been depressed for the time specified.
Configuration Page 2
AC Filter
The CP 20 removes 60Hz or 50Hz interference. The setting you select depends on the line frequency in your
country. Always use the 60Hz setting in the United States. If the AC interference is present, check to see that the
proper AC filter is selected.
Filter
The ECG plot frequency filter (or print filter) can be set to 40Hz, 150Hz, or 300Hz. The plot frequency filter does
not filter the acquired digital record. A 40Hz plot filter setting will reduce the noise (40Hz and higher frequencies)
on the printed ECG, a 150Hz plot filter setting will reduce the noise (150Hz and higher frequencies) on the printout
and a 300Hz plot filter setting will not filter the printed ECG.
Paper Speed
The writer speed can be configured at 25mm/s or 50mm/s for default ECG printouts. For rhythm printouts and
display, speeds of 5mm/s or 10mm/s are also available. See Section 4 to change speeds for display or rhythm
printing.
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